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From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Fri, 14 Oct 2005 11:00:16 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/dev/em if_em.c
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glebius     2005-10-14 11:00:16 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/em           if_em.c 
  Log:
  From the PR:
  
    The receive function em_process_receive_interrupts() unlocks the
    adapter while ether_input() processes the packet, and then locks
    it back. In the meantime, em_init() may be called, either from
    em_watchdog() from softclock interrupt or from the ifconfig(8)
    program. The em_init() resets the card, in particular it sets
    adapter->next_rx_desc_to_check to 0 and resets hardware RX Head
    and Tail descriptor pointers. The loop in
    em_process_receive_interrupts() does not expect these things to
    change, and a mess may result.
  
  This fixes long wedges of em(4) interfaces receive part under high
  load and IP fastforwarding enabled.
  
  PR:             kern/87418
  Submitted by:   Dmitrij Tejblum <tejblum yandex-team.ru>
  
  Revision  Changes    Path
  1.77      +14 -14    src/sys/dev/em/if_em.c